A Study of Phytogeographic Distribution and Molecular Systematics of Subfamily Atriplicioideae in China
|School||Xinjiang Agricultural University|
|Course||Ornamental Plants and Horticulture|
|Keywords||Saltbush subfamily Geographic distribution pattern Feature Floristic composition Nuclear rDNA ITS sequences Kinship|
In this thesis, China saltbush plants subfamily research object, plant geography approach to species (species) as the research unit to study the various species within the subfamily Geographical distribution patterns, characteristics, floristic composition and range in major provincial distribution. Using maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference method (BI), to build China plant saltbush subfamily phylogenetic tree, clear each taxonomic groups explore possible genetic relationship between, for urban greening Choose introduced plants and provide scientific basis for crossbreeding. Conclusions of this study are as follows: China saltbush subfamily flora geographical component analysis results showed that: a temperate species has 19 ingredients, mostly located in the desert and semi-desert regions. Subtropical species has three components, namely, creeping saltbush (Atriplex repens Roth), seaside quinoa (Atriplex maximowicziana Makino) and Oceania saltbush (Atriplex nummularia Lindl.), Which are mainly distributed in Fujian, Guangdong, Taiwan coast. Species belonging to the Tibetan Plateau has four components, namely, small fruit saltbush (Microgynoecium tibeticum Hook. F.), Supine axis quinoa (Axyris prostrata L.), cushion-like Ceratoides (Krascheninnikovia compacta (Losina-Losinskaja) Grubov) and single-sex saltbush (Archiatriplex nanpinensis GL Chu), which are mainly distributed in the high altitude areas above 2000m. China saltbush subfamily geographical distribution of plants there are four main characteristics: First, the unique phenomenon obviously. Single-sex Atriplex genus (Archiatriplex GL Chu) and small fruit genus Atriplex (Microgynoecium Hook.f.) is endemic in Asia, C. ewersmanniana (Krascheninnikovia ewersmannia (Stschegleev ex Losina-Losinskaja) Grubov), white saltbush (Atriple cana CA Mey), pod quinoa (Ceratocarpus arenarius L.) and other species in our country only distributed in Xinjiang. Second, the Old and the Young floristic elements coexist. Both single-sex saltbush (Archiatriplex nanpinensis GL Chu), Ceratoides (Krascheninnikovia ceratoides (Linn.) Gueldenstaedt) and other ancient ingredients, but also cushion Ceratoides (Krascheninnikovia compacta (Losina-Losinskaja) Grubov) and other young constituents. Third, with a typical distribution of temperate arid desert nature. Most saltbush plants belonging to the subfamily temperate elements, they become desert, the Gobi zone dominant species or constructive species. Fourth, with the Central Asian flora close. China saltbush plants 82.14% subfamily species distributed in Xinjiang, 42.86% distributed in Gansu, there are 18 kinds of species shared with Central Asia. Subfamily of China saltbush plants phylogenetic analysis The main conclusions are: First, China saltbush plants do not form a subfamily monophyletic group, but within the subfamily genus Atriplex, Chenopodium axis and respectively Ceratoides formed monophyletic. Second, Chenopodium is a multi-clade, and with the genus Atriplex very closely. Third, do not support the Chinese Atriplex an internal re-divided Obione CA Mey this taxon. This study is intended Atriplex China is divided into two parts: Atriplex 1 and Atriplex 2. Fourth, the study identified a Chinese individual plant genus Atriplex subfamily positional relationship between the systems. Small fruit small fruit genus Atriplex Atriplex (Microgynoecium tibeticum Hook. F.) Is Chenopodium genus Atriplex transition to one kind. Ceratoides (Krascheninnikovia Gueldenstaedt) large differentiation within species, which is closely related with the shaft Chenopodium, but distantly related genus Atriplex. Fifth, proved the Chinese and foreign saltbush Atriplex plant subfamily subfamily plant relationships. 9 kinds of experiments selected foreign genus Atriplex Atriplex 2 branch of China with the kind of close. This is saltbush subfamily introduction and cultivation of plants provide molecular evidence.